An Economical Analysis for a Hybrid Data Backup System

Masanori ODAGIRI; Tadashi DOHI; Naoto KAIO; Shunji OSAKI

An Economical Analysis for a Hybrid Data Backup System

Masanori ODAGIRI, Tadashi DOHI, Naoto KAIO, Shunji OSAKI

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This article considers a hybrid data backup model for a file system, which combines both conventional magnetic disk (MD) and write-once, read-many optical disk (OD). Since OD recently is a lower cost medium as well as a longer life medium than the ordinary MD, this kind of backup configuration is just recognized to be important. We mathematically formulate the hybrid data backup model and obtain the closed-form average cost rate when the system failure time and the recovery time follow exponential distributions. Numerical calculations are carried out to obtain the optimal backup policy, which is composed of two kinds of backup sizes from the main memory to MD and from MD to OD and minimizes the average cost rate. In numerical examples, the dependence of the optimal backup policy on the failure and the recovery mechanism is examined.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E79-A No.1 pp.118-125

Publication Date: 1996/01/25

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Type of Manuscript: PAPER

Category: Reliability and Fault Analysis

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Masanori ODAGIRI, Tadashi DOHI, Naoto KAIO, Shunji OSAKI, "An Economical Analysis for a Hybrid Data Backup System" in IEICE TRANSACTIONS on Fundamentals, vol. E79-A, no. 1, pp. 118-125, January 1996, doi: .
Abstract: This article considers a hybrid data backup model for a file system, which combines both conventional magnetic disk (MD) and write-once, read-many optical disk (OD). Since OD recently is a lower cost medium as well as a longer life medium than the ordinary MD, this kind of backup configuration is just recognized to be important. We mathematically formulate the hybrid data backup model and obtain the closed-form average cost rate when the system failure time and the recovery time follow exponential distributions. Numerical calculations are carried out to obtain the optimal backup policy, which is composed of two kinds of backup sizes from the main memory to MD and from MD to OD and minimizes the average cost rate. In numerical examples, the dependence of the optimal backup policy on the failure and the recovery mechanism is examined.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e79-a_1_118/_p

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@ARTICLE{e79-a_1_118,
author={Masanori ODAGIRI, Tadashi DOHI, Naoto KAIO, Shunji OSAKI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={An Economical Analysis for a Hybrid Data Backup System},
year={1996},
volume={E79-A},
number={1},
pages={118-125},
abstract={This article considers a hybrid data backup model for a file system, which combines both conventional magnetic disk (MD) and write-once, read-many optical disk (OD). Since OD recently is a lower cost medium as well as a longer life medium than the ordinary MD, this kind of backup configuration is just recognized to be important. We mathematically formulate the hybrid data backup model and obtain the closed-form average cost rate when the system failure time and the recovery time follow exponential distributions. Numerical calculations are carried out to obtain the optimal backup policy, which is composed of two kinds of backup sizes from the main memory to MD and from MD to OD and minimizes the average cost rate. In numerical examples, the dependence of the optimal backup policy on the failure and the recovery mechanism is examined.},
keywords={},
doi={},
ISSN={},
month={January},}

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TY - JOUR
TI - An Economical Analysis for a Hybrid Data Backup System
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 118
EP - 125
AU - Masanori ODAGIRI
AU - Tadashi DOHI
AU - Naoto KAIO
AU - Shunji OSAKI
PY - 1996
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E79-A
IS - 1
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - January 1996
AB - This article considers a hybrid data backup model for a file system, which combines both conventional magnetic disk (MD) and write-once, read-many optical disk (OD). Since OD recently is a lower cost medium as well as a longer life medium than the ordinary MD, this kind of backup configuration is just recognized to be important. We mathematically formulate the hybrid data backup model and obtain the closed-form average cost rate when the system failure time and the recovery time follow exponential distributions. Numerical calculations are carried out to obtain the optimal backup policy, which is composed of two kinds of backup sizes from the main memory to MD and from MD to OD and minimizes the average cost rate. In numerical examples, the dependence of the optimal backup policy on the failure and the recovery mechanism is examined.
ER -